[Opened]
jCommunity login

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I've begun using jCommunity to save me the trouble of coding all the registration and validation stuff, but after installation the site is still giving me the jAuth login form when accessing actions such as default:index. Can I set it to give the jCommunity login form instead?

Then see the difference with your project and this app in the var/config directory
I suspect that you have another auth plugin activated in your defaultconfig.ini.php, as you'll see, the auto install of the module only activate the plugin in index/config.ini.php

[Opened]
jCommunity login

I was playing jcommunity, and noticed that there might be a disturbing thing after installing,
If the start action is the one by default after a createapp:

startModule=myapp
startAction="default:index"

We are stuck in an infinite loop, it's because of this default param in auth.coord.ini.php: on_error_action = "jcommunity~login:out" (sorry :+o make a smiley)
Wich should be on_error_action = "jcommunity~login:index"

[Opened]
jCommunity login

I should note that I am working with Jelix 1.1 and jCommunity 0.2, and that I am not using any other auth plugins (or at least I think so). Nevertheless, I have followed your steps and did the installation by hand as described in the documentation.

In this test from scratch, the

startModule=jcommunity
startAction="login:index"

bits make the jCommunity login form display when accessing the application index, as expected. however, when I access index.php/myapp/default/index or any other controller action, I get a jAuth login form and not a jCommunity login form, just like with my application.